Measurement-computing USB-5203 Instrukcja Użytkownika Pobierz pdf (Strona 26)

USB-5203 User's Guide Specifications

Table 9. Throughput rate specifications

Number of Input

Channels

Maximum Throughput

1 2 Samples/second

2 2 S/s on each channel, 4 S/s total

3 2 S/s on each channel, 6 S/s total

4 2 S/s on each channel, 8 S/s total

5 2 S/s on each channel, 10 S/s total

6 2 S/s on each channel, 12 S/s total

7 2 S/s on each channel, 14 S/s total

8 2 S/s on each channel, 16 S/s total

Digital input/output

Table 10. Digital input/output specifications

Parameter Specification

Digital type CMOS

Number of I/O 8 (DIO0 through DIO7)

Configuration Independently configured for input or output.

Power on reset is input mode unless bit is configured for alarm.

Pull up/pull-down

configuration

All pins pulled up to +5 V via 47 K resistors (default). Pull down to ground (GND) also

available.

Digital I/O transfer rate

(software paced)

 Digital input – 50 port reads or single bit reads per second typ

 Digital output – 100 port writes or single bit writes per second typ

Input high voltage 2.0 V min, 5.5 V absolute max

Input low voltage 0.8 V max, –0.5 V absolute min

Output low voltage

(IOL = 2.5 mA)

0.7 V max

Output high voltage

(IOH = –2.5 mA)

3.8 V min

Note 2: All ground pins on the device (pins 9, 19, 28, 38) are common and are isolated from earth ground. If a

connection is made to earth ground when using digital I/O and conductive thermocouples, the

thermocouples are no longer isolated. In this case, thermocouples must not be connected to any

conductive surfaces that may be referenced to earth ground.

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